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【简答题】
圆形等截面梁的直径 d=30mm ,危险截面的正应力 σ max =100Mpa ,则危险截面的弯矩 M max = N.m. 。
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A.
由2字节的端口ID和6字节网桥的MAC地址组成
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由2字节的优先级和6字节网桥的MAC地址组成
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